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A146223 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 101-111-010 pattern in any orientation. 0

%I

%S 1,1,1,1,5,21,64,303,1134,7339,57196,589857,6245651,99774377,

%T 1593180484,36586038636,878744243108,30250721237881

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 101-111-010 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.1.0.1

%e .0.0.0.0.0.1.1.1

%e .0.1.0.0.0.0.1.0

%e .1.1.1.0.0.1.0.1

%e .1.0.1.0.0.1.1.1

%e .0.1.0.0.0.0.1.0

%e .1.1.1.0.0.0.0.0

%e .1.0.1.0.0.0.0.0

%K nonn

%O 1,5

%A _R. H. Hardin_

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Last modified January 19 14:34 EST 2022. Contains 350466 sequences. (Running on oeis4.)